顺便说一下，如果你好奇为什么在判断牙齿年龄方面、外消旋化会比碳14定义的时钟精度差之甚多，那么部分原因与温度相关。
By the way, if you're curious about why racemization is so much less accurate a clock than C-14 for dating a tooth's age, part of the explanation has to do with temperature.
无论年龄大小，良好的口腔卫生和定期的牙齿保健都非常重要。
Good oral hygiene and regular dental care are important, whatever your age.
通常说来，年龄是通过生理特征确定的，譬如牙齿或骨骼。
Usually, age is determined by physical characteristics, such as teeth or bones.
因此，倘若尸身被置于火场中，会完全扭曲外消旋化技术所判断的牙齿外观年龄——尸身被置于沙漠也同理。
So being in a fire will totally distort a tooth's apparent age via this technique - as might being left in a desert.
一些人认为到一定年龄牙齿就会脱落。
俄勒冈大学和俄勒冈州立大学的研究人员对中美洲的切叶蚁进行了研究，他们发现，蚁群中的年轻和精力充沛的成员被委派去做最艰难的工作——将蚁群收集起来的叶片切成碎片。这些身强力壮的切叶蚁用它们锐利的牙齿做起这种工作来很有效率，但是随着年龄的增长，它们的牙齿也会变得破旧而迟钝。
A study of Central American leaf-cutter ants has shown that the younger and more vigorous members of the colony are given the toughest job of cutting through the leaves they harvest.
然而，当研究人员将两项技术一并运用于牙齿上，他们意识到外消旋化提供了一个额外的有用细节，能成为个体死亡年龄的良好衡量标准。
However, when the researchers applied both techniques to teeth, they realized that the racemization offered an additional useful detail, a good gauge of an individual's age at death.
通过牙齿可以粗略地推算狗的年龄。
烟草，咖啡，蛀牙，年龄增长，药物都会使牙齿着色。
锯成两半的牙齿，科学家可以就近取得这种动物健康和年龄的资讯。
By sawing the teeth in half, scientists may closely gain information on the health and age of the animals.
随着年龄的增长，人失去什么东西最可怕——头发，牙齿，还是我们的好奇心？
What's the worst thing to lose as we get older? Our hair, our teeth, our curiosity?
马的牙齿护理的程度和频率要根据马的年龄来决定。
The age of the horse will affect the degree of attention and frequency of dental care required.
到目前为止，犯罪情景研究院主要依赖于特殊的身体器官，比如牙齿，骨头和韧带来估计一个未出现的人的年龄。
Until now, crime scene investigators have depended on the availability of specific body parts, such as teeth, bones or ligaments, for estimating the age of otherwise unidentifiable persons.
随着年龄增长，我们牙齿外层的釉质会慢慢地磨损。
因为从马的牙齿可以看出它的年龄。
目的：通过调查普通人群牙齿切缘及咬面的磨耗情况，研究牙齿磨耗与年龄和性别的关系。
AIM: to study the correlation between tooth wear and age as well as gender by investigating the state of average tooth wear on incisal and occlusion surfaces in general population.
方法收集5组不同年龄组含有牙本质浅层龋的离体牙，每组各5颗牙齿。
Methods Collected 25 extracted teeth with shallow dentin caries in 5 age groups, each group 5 teeth.
根据对牙齿磨片牙骨质和牙齿齿质上的生长层组判断，其年龄约为2 9龄。
Based upon the growth layer groups in cementum and dentine of the tooth, the age of the huge Sperm Whale was estimated at 29 years.
目的为满足应用牙齿萌出时间推测年龄的需要。
目的为满足应用牙齿萌出时间推测年龄的需要。
应用推荐